209694961 has 12 divisors (see below), whose sum is σ = 249606192. Its totient is φ = 175556808.

The previous prime is 209694937. The next prime is 209694967. The reversal of 209694961 is 169496902.

It is not a de Polignac number, because 209694961 - 2⁵ = 209694929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209694967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47655 + ... + 51868.

It is an arithmetic number, because the mean of its divisors is an integer number (20800516).

Almost surely, 2^209694961 is an apocalyptic number.

It is an amenable number.

209694961 is a deficient number, since it is larger than the sum of its proper divisors (39911231).

209694961 is an equidigital number, since it uses as much as digits as its factorization.

209694961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99580 (or 99573 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 209694961 is about 14480.8480759933. The cubic root of 209694961 is about 594.1042577185.

The spelling of 209694961 in words is "two hundred nine million, six hundred ninety-four thousand, nine hundred sixty-one".